Digital tampering with (alias morphing) — voice, video, and photo — is now readily available on personal computers. It is very simple to tamper with digital image, video or audio information and make it available to others.
'Digital morphing', altering what an image looks like, is in use in information warfare and has been on the rise, especially on Twitter and Facebook. Images with printed dates that do not match, or images delivered as “proof” of certain troops being “somewhere in the middle east” yet small letters on a sign in the background are in Hindu are easy to detect as having been tampered with. TinEye will show previously uploaded images of an indicated image on the net. If it isn't found by TinEye, it doesn't mean it isn't morphed. The image may be new (and altered), or not in it's database. But if an older version is found that is different, the image was morphed.
In which case you can use techniques for detecting digital tampering that work on the assumption that although digital forgeries may leave no visual clues that indicate tampering, they may alter the underlying statistics of an image.